You can jack the vehicle up on jack stands.
Rotate one rear wheel one complete turn(360 degrees) if it's a posi rear end,& count how many times your pinion turns.
So if it (the pinion) turns a little over 3 times it's a 308, a littler under 3.5 turns should be 342's
My guess ,, 308's or 342's
If it is a non posi,jack up one wheel off of the ground,(the other wheel touching the ground)turn wheel 360 degrees,count how many turns the pinion turns,then devide by two.
Or take the cover off & count how many teeth on the ring & pinion & divide the two numbers.
The ring gear should be stamped how many teeth there are.I think the pinion also,but that's easy to count if it's not.
MBHD
